I got it, and save buckets over SMS, i've really cut down my phone bill. Some of my friends in Canada however ended up paying a bit more while using Yoober, it seems some Telco's charge data based on how long you stay online, rather then 'what you actually use'.

Has anyone else had experiences and is there any comparisons available to see which countries Yoober texting is free/cheaper then SMS, and which country it's better to just stick to SMS?